n = int(input())
print("Yes") if n >= 30 else print("No") n = int(input()) n int(input()) int input() input print("Yes") if n >= 30 else print("No") n >= 30 n 30 print("Yes") print "Yes" print("No") print "No" n = int(input()) int(input()) n
n = int(input())
print("Yes") if n >= 30 else print("No")